rust/src/lib/rand.rs

/**
 * Bindings the runtime's random number generator (ISAAC).
 */
native "c-stack-cdecl" mod rustrt {
    type rctx;
    fn rand_new() -> rctx;
    fn rand_next(c: rctx) -> u32;
    fn rand_free(c: rctx);
}

type rng =
    obj {
        fn next() -> u32;
        fn next_float() -> float;
    };

resource rand_res(c: rustrt::rctx) { rustrt::rand_free(c); }

fn mk_rng() -> rng {
    obj rt_rng(c: @rand_res) {
        fn next() -> u32 { ret rustrt::rand_next(**c); }
        fn next_float() -> float {
          let u1 = rustrt::rand_next(**c) as float;
          let u2 = rustrt::rand_next(**c) as float;
          let u3 = rustrt::rand_next(**c) as float;
          let scale = u32::max_value() as float;
          ret ((u1 / scale + u2) / scale + u3) / scale;
        }
    }
    ret rt_rng(@rand_res(rustrt::rand_new()));
}
// Local Variables:
// mode: rust;
// fill-column: 78;
// indent-tabs-mode: nil
// c-basic-offset: 4
// buffer-file-coding-system: utf-8-unix
// compile-command: "make -k -C $RBUILD 2>&1 | sed -e 's/\\/x\\//x:\\//g'";
// End: